Error 7312 During Shape Optimization


Hi Everyone,
I'm trying to fine-tune a topology optimized part using free shape optimization on some of the members. Unfortunately when I run Optistruct, it gives me the following:
*** ERROR # 7312 ***
DSHAPE card 1 contains 2 disconnected patches. Patch(es) listed
below contain too few grids that are likely insufficient for defining a smooth
surface/curve.
I can't find anything on this error. Also, it doesn't list any 'patches' so I'm not even sure where it's having problems. Any advice?
Thanks!
Find more posts tagged with


Thanks for your help! I think the issue was that near where the members meet the mesh strays slightly from the geometry to prevent really thin tetra elements and thus when I use select nodes by geom some nodes don't get selected and so there are patches of unselected nodes within the selected regions. I had been making a desvar for each member I wanted changed but considering my settings for all of them were the same I remade a single desvar containing all of the regions and the solver got past the point where the previous error was. However, now it is giving me:
*** ERROR # 1814 ***
VOLFRAC response on DRESP1 card 3 is not applied to a topology or free-size domain.
I'm doing a minimize volfrac objective with a stress constraint. Is this not allowed for a free-shape optimization?
Thanks!


Ok yeah now I realize my mistake. Volfrac doesn't exist for shape optimization because that doesn't make sense. I'll do a minimize volume objective.
Maybe you selected too few nodes or nodes are not adjacent , select more adjacent nodes again